DNA profiling — also called DNA fingerprinting — is the use of unique genetic sequences to identify individuals. Since Sir Alec Jeffreys’ 1984 discovery, DNA evidence has transformed criminal investigations, disaster victim identification, paternity disputes, wildlife crime cases and historical justice. In India, the Criminal Procedure (Identification) Act 2022, the new criminal laws of 2024 (BNS, BNSS, BSA), and the National Forensic Infrastructure Enhancement Scheme (NFIES, 2024) have taken forensic science mainstream. For UPSC, this is GS Paper III — Science & Technology, Internal Security with GS Paper II (Governance) overlaps.
What is DNA profiling?
The science
Every human genome has ~3 billion base pairs. 99.9% is identical across individuals. The remaining 0.1% includes:
- Short Tandem Repeats (STRs) — short DNA sequences repeated in varying numbers.
- Single Nucleotide Polymorphisms (SNPs) — single-base differences.
- Y-STRs for paternal lineage; mtDNA for maternal lineage.
A DNA profile is a signature of 13-24 STR markers selected to be highly polymorphic. The probability of two unrelated people sharing a 13-marker profile is roughly one in a billion.
Techniques
| Technique | Use |
|---|---|
| PCR (Polymerase Chain Reaction) | Amplifies tiny DNA samples |
| Capillary electrophoresis | Separates STR fragments |
| Next-Gen Sequencing (NGS) | Reads millions of bases |
| Mitochondrial DNA sequencing | Works with old/degraded samples |
| Forensic DNA phenotyping | Predicts appearance from DNA |
| Forensic genealogy (FGG) | Matches crime-scene DNA to public genealogy databases |
Applications
Criminal investigations
- Sexual assault cases — DNA from body fluids and clothes.
- Murder and homicide — bloodstains, hair, tissue.
- Property crimes — saliva on cigarettes, skin on touched surfaces.
- Exoneration — the US Innocence Project has exonerated 250+ wrongful convicts using DNA.
Disaster victim identification
- 2004 Indian Ocean tsunami, 2001 Gujarat earthquake, 2023 Odisha train accident — DNA critical where visual ID impossible.
Paternity and family disputes
- Maintenance disputes, inheritance, adoption verification, missing persons.
Wildlife crime
- Confirming species origin of seizures — tiger skins, pangolin scales, rosewood.
- Wildlife Institute of India maintains the National Reference Centre for Wildlife Forensics.
Historical cases
- Identification of remains of Tsar Nicholas II's family; Nazi war criminals; Ramses II mummy.
India's forensic-DNA architecture
Institutional ecosystem
| Body | Role |
|---|---|
| Centre for DNA Fingerprinting & Diagnostics (CDFD), Hyderabad | National apex DNA fingerprinting lab (DBT) |
| Central Forensic Science Laboratories (CFSLs) | Delhi, Chandigarh, Hyderabad, Kolkata, Pune, Bhopal — MHA |
| State Forensic Science Laboratories (FSLs) | One per state; many regional labs |
| National Forensic Sciences University (NFSU) | Gandhinagar; now multi-campus Institute of National Importance |
| Directorate of Forensic Science Services (DFSS) | Central directorate under MHA |
| Wildlife Institute of India Forensic Cell | Dehradun |
| NCRB CCTNS + NIDAAN | Criminal record databases |
Statutory framework
- Identification of Prisoners Act, 1920 — limited fingerprint/photograph record.
- Criminal Procedure (Identification) Act, 2022 — expanded to include iris scans, retinal scans, biological samples, biometric, behavioural attributes of arrested persons.
- Bharatiya Nagarik Suraksha Sanhita (BNSS), 2023 — effective 1 July 2024 replacing CrPC; mandates forensic examination for offences with ≥7-year punishment.
- Bharatiya Sakshya Adhiniyam (BSA), 2023 — replaces Evidence Act; gives electronic evidence primary status, including DNA.
- Bharatiya Nyaya Sanhita (BNS), 2023 — substantive penal code.
- DNA Technology (Use and Application) Regulation Bill — under parliamentary scrutiny since 2019; not yet enacted (2025).
The CrPC Identification Act 2022 — in detail
- Applies to arrested persons, detainees and convicts.
- Data may be retained up to 75 years.
- Empowers magistrates to direct sample collection.
- Concerns: privacy (Puttaswamy 2017), proportionality, chain-of-custody, access-and-use guardrails.
- Rules notified Sept 2022 — implementation by State Commissioners of Police and NCRB.
National DNA Database (pending)
The DNA Technology Regulation Bill envisions a National DNA Data Bank with indexes:
- Crime Scene Index.
- Suspects/Undertrials Index.
- Offenders Index.
- Missing Persons Index.
- Unknown Deceased Persons Index.
Critics raise privacy, discrimination, false-match and consent concerns.
New criminal laws and forensics — 1 July 2024 onwards
The three new codes treat forensic investigation as a default not an optional step.
- Offences punishable with 7 years or more — mandatory forensic visit.
- Videographed search, seizure and collection of samples.
- zero-FIR and online FIR provisions, enabling faster forensic timelines.
- e-Sakshya app for video-documented evidence (trialled 2024).
- Each state to ensure adequate forensic capacity; NFIES (Rs 2,254 crore, Sept 2024) funds state FSL capacity.
Recent landmark Indian cases
- Naveen Murder Case (Himachal Pradesh, 2000s) — among the early DNA convictions.
- Nithari serial killings (2006-2024) — DNA profiled victims years later.
- Nirbhaya case (2012) — DNA corroborated identification of accused.
- Hyderabad vet case (2019) — DNA traced accused's weapons and clothes.
- Shraddha Walkar case (2022-23) — DNA from scattered remains central to prosecution.
- Kanchanjunga train accident, Manipur violence, Odisha Balasore train crash (2023-24) — DNA for victim identification.
- Odisha Balasore victim DNA matching (2023-24) — identified 41 unclaimed bodies.
Forensic science beyond DNA
- Fingerprint analysis (NAFIS — National Automated Fingerprint Identification System, 2022).
- Digital forensics — mobile, cloud, IoT, crypto-wallet.
- Cyber forensics — I4C (Indian Cyber Crime Coordination Centre).
- Ballistics.
- Toxicology — drug, poison detection.
- Document and handwriting analysis.
- Questioned document/stamped impression analysis.
- AI-driven facial recognition under CCTNS.
- Odontology, anthropology, entomology in complex cases.
Privacy and ethical concerns
| Concern | Detail |
|---|---|
| Data-bank misuse | Mission creep beyond criminal cases |
| Genetic discrimination | Insurance, employment |
| Familial matches | Can implicate innocent relatives |
| Chain of custody | Sample contamination, mis-labelling |
| Consent for minors/marginalised | Due-process gaps |
| Storage safeguards | Cybersecurity of FSLs |
| Over-reliance | CSI-effect: juries may undervalue non-DNA evidence |
| International data-sharing | Interpol, cross-border requests |
Latest developments (2024-26)
- New criminal laws operational (1 July 2024) — BNS, BNSS, BSA.
- NFIES launched (Sept 2024) — Rs 2,254 crore to upgrade state FSLs, NFSU campuses, mobile forensic labs.
- NFSU multi-campus expansion — Delhi, Goa, Tripura, Manipur campuses operational; international campus in Uganda.
- e-Sakshya app rollout (2024-25) — videographed crime scene evidence.
- CCTNS + NIDAAN — AI-based pattern analysis for unsolved cases.
- Legal aid initiative on DNA Bill (2024-25) consultations.
- AI Action Summit, Paris (Feb 2025) — discussed AI in forensic labs.
- India Semiconductor Mission — sequencer chips as strategic interest.
- DeepTech Policy 2024 — forensic-tech startups covered.
- National Quantum Mission (2024) — quantum sensors for ultra-trace forensic DNA.
- Chandrayaan-4 plan and Gaganyaan progress — space-biology research cross-feeds microbial forensics.
UPSC Relevance
GS Paper III — Science & Technology
- DNA profiling, forensics.
GS Paper III — Internal Security
- New criminal laws, CrPC (Identification) Act, crime investigation reforms.
GS Paper II — Governance
- NFIES, NFSU, institutional capacity.
GS Paper IV — Ethics
- Privacy vs investigation; genetic discrimination.
Prelims pointers — CDFD Hyderabad, NFSU, DNA Tech Bill, CrPC (Identification) Act 2022, BNSS 1 July 2024, STR markers, NAFIS, NFIES.
Interview probes — balancing privacy and crime control; state FSL capacity; AI in forensics; consent for samples.
DNA profiling is neither a panacea nor a magic wand — its power depends on sound science, sturdy institutions and strict safeguards. India is quietly building all three. The civil servant of the 2030s will see forensic science as standard policing equipment.
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